Mocha Cake with Fluffy Meringue Topping

Since 2006, readers have professed their love for contest winner Anna Ginsberg's One-Bowl Chocolate Mocha Cream Cake, touting it as the moistest cake ever. We agree—the cake is incredible. But online reviews suggested that the topping could use some tweaking. Instead of the original "mocha cream" of whipped topping, marshmallow creme, and coffee, we now have a creamy, less-sweet meringue. We also replaced reduced-fat mayonnaise (yes, mayo—it's the secret ingredient that makes for a fantastically moist cake) with canola mayo, our current product of choice.